Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 66: Topical session: Dynamics, relaxation and deformation in deeply supercooled metallic liquids and glasses VI - mechanical properties

MM 66.4: Vortrag

Donnerstag, 23. März 2017, 16:45–17:00, IFW A

Probing the mechanical properties of metallic glasses using avalanche dynamics — •Carlos Herrero-Gómez and Konrad Samwer — 1 Physikalisches Institut, Georg-August Universität Göttingen, Göttingen, Germany

Amorphous solids have been discovered, fabricated and used by mankind for more than 2000 years. Despite this fact the microscopic origin of the plasticity in such materials remain nowadays elusive. Recently such problem have been approached from the perspective of the avalanche dynamics, which allows to analyze correlations during deformation [1]. We report the avalanche analysis of several deformation experiments in metallic glasses. Based in creep tests of PdCuSi metallic glasses, we report a crossover on the deformation behavior that we associate to the strain rate [2]. In addition, we use creep tensile experiments on several amorphous materials to show that the avalanche statistics are reproduced in different systems. Finally we analyze the effect of an external magnetic field on the mechanical properties of a magnetostrictive magnetic metallic glasses, in order to study the magneto-mechanical coupling. Financial support from the ITN-FP7 Marie Curie program VitriMetTech N. 607080 is thankfully acknowledged.

Literature:

[1] Salje et al Annu. Rev. Condens. Matter Phys. 5.1 (2014): 233-254.

[2]C.Herrero-Gómez and Konrad Samwer. Scientific Reports 6 (2016).